Can you tell the difference between porcelain veneers and natural teeth?

I am considering getting veneers on my upper laterals. My dentist advised that I may want to consider getting my two front teeth done as well and perhaps even the canines too. I don't really want to get veneers where I don't need to - I don't want to meddle with healthy teeth. But if it is quite noticeable - or often becomes quite noticeable over time - the difference between veneers (on laterals) and natural teeth then I would consider getting more than just the laterals done.